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Alcohol and Alcoholism Vol. 49, No. 2, pp. 154-159, 2014 
Advance Access Publication 28 November 2013 



doi: 10.1093/alcalc/agtl74 



Exposure of Children and Adolescents to Alcohol Marketing on Social Media Websites 

Eleanor M. Winpenny' *, Theresa M. Marteau^ and Ellen Nolte^ 

'rand Europe, Westbrook Centre, Milton Road, Cambridge CB4 1 YG, UK and ^Behaviour and Health Research Unit, 
Department of Public Health and Primary Care, University of Cambridge, Forvie Site, Robinson Way, Cambridge CB2 OSR, UK 
♦Corresponding author: RAND Europe, Westbrook Centre, Milton Road, Cambridge CB4 lYG, UK. 
Tel.: +44-1223-222742; Fax: -1-44-1223-358-845; E-mail: winpenny@rand.org 

{Received 12 July 2013, first review notifiedll September 2013; in revised form 21 October 2013; accepted 24 October 2013) 

Abstract — Aims: In 201 1, online marketing became the lai'gest mai'keting channel in the UK, overtaking television for die first time. 
This study aimed to describe the exposure of children and young adults to alcohol marketing on social media websites in the UK. 
Methods: We used commercially available data on the three most used social media websites among young people in the UK, from 
December 2010 to May 201 1. We analysed by age (6-14 years; 15-24 years) and gender the reach (proportion of internet users who 
used the site in each month) and impressions (number of individual pages viewed on the site in each month) for Facebook, YouTube 
and Twitter. We further analysed case studies of five alcohol brands to assess the mai'keter-generated brand content available on 
Facebook, YouTube and Twitter in February and March 2012. Results: Facebook was the social media site with the highest reach, with 
an average monthly reach of 89% of males and 91% of females aged 15-24. YouTube had a similar average monthly reach while 
Twitter had a considerably lower usage in die age groups studied. All five of the alcohol brands studied maintained a Facebook page. 
Twitter page and YouTube channel, with varying levels of user engagement. Facebook pages could not be accessed by an under- 18 
user, but in most cases YouTube content and Twitter content could be accessed by those of all ages. Conclusion: The rise in online mar- 
keting of alcohol and the high use of social media websites by young people suggests that this is an area requiring further monitoring 
and regulation. 



INTRODUCTION 

Alcohol is one of the three leading risk factors for global 
disease burden (Lim et ai, 2012), and in adolescents in par- 
ticular increases the likelihood of injury and risky behaviour 
such as unsafe sex (Bonomo et ai, 2002). Exposure to alcohol 
marketing has been identified as one factor that may lead to 
underage alcohol consumption (Anderson et ai, 2009). 

The internet is an area where exposure of young people to 
alcohol marketing is potentially high. In Europe, up to 30% of 
internet users are under the age of 25 years and the time spent 
online tends to be highest in this group, at around 30 h per 
month (comScore, 201 1). In the UK, alcohol marketing on the 
internet is regulated by the UK Code of Non-broadcast 
Advertising, Sales Promotion and Direct Marketing (The CAP 
code) (Committee of Advertising Practice, 2010). The regula- 
tion covers both the content and targeting of alcohol marketing 
in an attempt to protect young people from such marketing. 
Yet existing evidence suggests that the regulation may fall 
short of achieving this goal. For example, Gordon (2011) and 
The Centre on Alcohol Marketing and Youth (2004) have 
shown how websites maintained by alcohol brands host a 
variety of content, including content that may be particularly 
appealing to children and adolescents such as games, down- 
loadable content, e.g. screensavers, and cartoons. 

A more recent phenomenon is the emergence of alcohol 
marketing through social media websites. Studies have high- 
lighted the large volume of alcohol-related content presented 
on such websites and the inadequacy of current mechanisms 
to protect adolescents from online marketing exposure (Mart 
et ai, 2009; Moreno et ai, 2010; Leyshon, 2011; Nicholls, 
2012). Existing work has examined the way in which this 
content is designed to influence the audience (McCreanor 
et ai, 2005; Chester et ai, 2010) and pinpoint new tactics, 
such as the use of viral marketing to encourage users to 
endorse a product by word-of-mouth (Mart, 2011) and user 



engagement with the brand (Montgomery and Chester, 2009). 
There are concerns that such strategies may increase the effect 
of marketing on young people, and further social science re- 
search is needed to understand the mechanisms through which 
such marketing operates. 

The impact of online marketing on young people is likely to 
depend both on the content and the quantity of such exposure 
among young people. A recent study suggested that the 
highest frequency of alcohol marketing seen by adolescents 
online is on social networking sites (SNS) (Hartigan and Coe, 
2012). We extend this work, focusing on the exposure of 
young people to alcohol marketing on social media websites 
(including SNS). Specifically, we seek to explore the range of 
social media websites that are most used by young people 
online and the alcohol marketing content that is presented on 
these websites, to better understand the nature and scope of ex- 
posure of young people to online alcohol marketing. We 
further examine the restrictions that are in place on underage 
access to alcohol marketing online in order to assess the poten- 
tial effectiveness of marketing self-regulation on exposure to 
marketing content online. 

METHODS 

Data 

We obtained data on online audiences from Ebiquity, a media 
and marketing analytics company that draws on comScore, a 
widely used resource for digital reach and penetration data 
(comScore, 2012). We obtained data on the three most viewed 
social media websites among those aged under 25 for each 
month from December 2010 to May 2011 based on unique 
user figures, disaggregated by age (6-14 years; 15-24 years) 
and gender. 

Data provided information on percentage reach, that is, the 
percentage of available internet users in a given age/gender 



© The Author 2013. Published by Oxford University Press on behalf of the Medical Council on Alcohol. 

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/ 
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Exposure to alcohol marketing on social media websites 



155 



group who used the site in question in each month, and 
impressions, which refers to the number of individual pages 
that the selected age/gender group viewed on that site in each 
month. We describe these figures for the overall three most 
viewed social media websites (Facebook, YouTube and 
Twitter), by age and gender, averaged across the period from 
December 2010 to May 201 1 . 

Alcohol brand case studies 

Given our finding that Facebook, YouTube and Twitter were 
the three most viewed social media websites across the months 
investigated, we selected these as case studies to better under- 
stand alcohol marketing and user engagement with this 
marketing. 

For Facebook, YouTube and Twitter, we examined user en- 
gagement with five alcohol brands that we identified in a 
related analysis as those with the highest advert impacts (total 
number of views of an advert) in television advertising among 
the 4-15 year age group in the UK (Winpenny et ai, 2012). 
These were: Foster's (beer), Tia Maria (liqueur), Stella Artois 
(beer), Carling (beer) and Magners (cider). 

For each brand we identified the marketer-generated brand 
presence on Facebook, YouTube and Twitter. In this study we 
focused on alcohol content that derived from the alcohol mar- 
keters, rather than user-generated content, such as fan pages or 
interest groups. Marketer-generated brand content was identi- 
fied either by following links from the alcohol brand website, 
by a statement 'this is the official page' on the social media 
page or by the presence of content originating from the alcohol 
brand, such as competitions and product giveaways. Where 
more than one marketer-generated page was available, typically 
associated with different countries, we chose the UK page. 

For each of the five alcohol brands we further assessed the 
content of the designated Facebook page, YouTube channel 
and Twitter profile. Specifically, we assessed the type and 
quantity of marketer-generated content and the frequency of 
marketer updates. We also examined the links from each page 
to other online marketing sites for that brand, and the presence 
of responsible drinking or age control messages. We further 
explored age restrictions on marketer-generated social media 
content on Facebook, Twitter and YouTube, by means of fic- 
tional user profiles. We set up two profiles for each social 
media channel, one for a fictional user aged under 18 years 
(age 14) and one for a fictional user older than 18 years (age 
24). We used these profiles to visit Facebook, YouTube and 
Twitter, to assess what content could be accessed. This 
allowed us to determine the use of age-restriction mechanisms 
for each of the five alcohol brands chosen. 

Analyses as described in this paper were carried out from 
February to April 2012. Online content tends to change fre- 
quently within short periods of time; we therefore give precise 
dates for each of the observations made. 



RESULTS 

Online audience data showed that, in the UK, Facebook and 
YouTube were the top two most viewed social media websites 
used by those aged 6-14 and 15-24 years between December 
2010 and May 2011. Twitter was the third most viewed social 
media website in all these months for the 15-24 age group. 



Table 1 . Reach and impressions of Facebook, YouTube and Twitter among 
males and females, age 6-14 and 15-24, monthly data, averaged across 
December 2010 - May 201 1 



Males 6-14 Females 6-14 Males 15-24 Females 15-24 





Average reach (% of internet users) 




Facebook 


39 48 89 


91 


YouTube 


41 43 81 


73 


Twitter 


5 10 19 


19 




Average number of impressions (inillion) 




Facebook 


697 934 2782 


2717 


YouTube 


230 154 799 


460 


Twitter 


5 82 22 


52 



Source: Ebiquity. 

Note: Twitter data for those aged 6-14 is averaged across the 3 months 
(males) and 5 mondis (females) where Twitter was among the three most 
viewed social media sites for these groups. 



but this differed for the 6-14 age group with both Formspring 
and Wikia taking third place in certain months. Table 1 pre- 
sents the summary metrics for Facebook, YouTube and 
Twitter, averaged across the 6 months studied. 

Presence of alcohol brand content on Facebook, Twitter and 
YouTube 

For all five alcohol brands studied, Foster's (beer), Tia Maria 
(liqueur), Stella Artois (beer), Carling (beer) and Magners 
(cider), we identified Facebook pages by following a link 
from the alcohol brand website or by the presence of marketer- 
generated content, such as competitions for brand products. 
Some Facebook pages also included a statement such as 
'Welcome to the official Tia Maria page on Facebook.' 
(Facebook, 2012c). Similarly, all brands maintained a direct or 
indirect link to Twitter from their websites. Conversely, links 
to YouTube marketer-generated content were less obvious. 
While we identified a YouTube channel that was associated 
with all five brands, it was only possible to confirm that 
Foster's, Magners and TiaMaria presented marketer-generated 
content as exemplified by a web link from the Foster's and 
Magners brand website, or direct statements ('Welcome to the 
official Tia Maria channel on YouTube!' (YouTube, 2012)). 
While we have included the findings from Carling and Stella 
Artois YouTube channels in Table 3, it should be noted that 
these may be user-generated rather than marketer-generated. 

User engagement with alcohol brand content on Facebook, 
Twitter and YouTube 

The levels of user engagement with marketer-generated social 
media websites are shown in Table 2. For each brand page, we 
made use of features embedded in the social media website, 
such as Facebook 'likes', the number of subscribers 
(YouTube) or followers (Twitter). We were unable to disag- 
gregate this information by age. 

Facebook engagement can be assessed by the number of 
likes and the number of 'People Talking About This' 
(Table 2). Likes are created when a user clicks on a 'like' 
button on the brand page, to indicate that they like a brand 
(Facebook, 2012b). This can only be performed once by each 
user. It then places a 'story' on the user's profile wall, which 
will also be shown in the news feed of the user's friends, 
reporting that the user liked the page, and providing a link to 
the brand page. Once the user has 'liked' a page, s/he will 



156 Winpenny e/ a/. 



Table 2. User engagement with social media sites (21 March 2012) 




rostGr s 


L^arlmg 


1 Id. iVldlld. 




JVl3.gri6rs 


Facebook: Likes 


127,268 


75,328 


70,024 


183,091 


122,486 


Facebook: 'People Talking About This' 


2767 


2165 


557 


2628 


1003 


YouTube: Subscribers 


11,561 


51" 


14 


49" 


46 


YouTube: Video views 


9,351,097 


94,172" 


30,584 


14,837" 


93,681 


Twitter: Followers 


3812 


47*' 


1298 


3310'' 


3984 



"These pages may have been marketer-generated or user-generated. 
''As of 27 March 2012. 



receive updates in his/her wall from that page. Facebook' s 
'People Talking About This' gives an indication of the 
number of people who created a 'story' about a page in a 
7-day period. 'Stories' can be created by liking a page, but 
also by other activities, including posting on a page wall, 
liking a post, answering a question, responding to an event 
and several other actions (Inside Facebook, 2012). 

The item 'YouTube subscribers' in Table 2 indicates the 
number of people who have 'subscribed' to the YouTube 
channel. YouTube content is organized into YouTube chan- 
nels which can be created by an individual or by a brand, and 
is where the video content created by that individual/brand is 
stored. Subscribing to a channel adds this channel to a user's 
homepage and the user will then receive updates from the 
channel. The item 'Twitter: Followers' shows the number of 
people who have signed up to follow the company in question 
on Twitter, so that tweets (short messages) from the brand 
account appear in the individual user's Twitter feed. 



Content of alcohol marketing on Facebook, 
YouTube and Twitter 

We analysed the content of alcohol marketing on Facebook, 
YouTube and Twitter to assess the extent to which marketing 
was delivered through each medium, the types of content pre- 
sented and the ways in which users were induced to engage 
with and share each medium. Due to the different natures of 
each of the three social media websites, it was not possible to 
categorize content in the same way across all social media 
types. Instead, we noted the types of content that were found, 
focussing particularly on links to other social networking web- 
sites and any responsible drinking or age control messages 
(Table 3). 

YouTube is primarily a video sharing platform and the 
content of alcohol brand channels included product adverts, 
demonstrations of how to prepare cocktails (Tia Maria), videos 
about how the adverts were made, and comedy videos. Twitter 
is based on what is known as a twitter 'feed' which is populated 
by 'Tweets', short comments made by those holding individual 
or organizational Twitter accounts. Facebook operates a multi- 
functional platform, revolving around a user or brand Facebook 
page. Brand marketers and other users can post comments, 
share photos and videos and also upload applications, such as 
games. An additional Facebook function is the 'like' button 
which allows users to indicate that they like the brand and then 
links the two user profiles, allowing the brand to share further 
marketing with the user. Use of the 'like' button also places a 
message on the Facebook page of friends of the user, letting 
them know that the user 'liked' a certain page (Lipsman et ai, 
2011; Facebook, 2012b). In some cases 'likes' were actively 



encouraged, for example requiring a user to 'like' a page before 
they could enter a competition. 

Across the three social media platforms investigated, dif- 
ferent alcohol brands structured their online activity around 
different themes intended to engage social media users. 
Foster's online activity was centred on Foster's sponsored 
comedy videos. The YouTube channel and Facebook page 
both showed comedy videos, and the Twitter feed discussed 
these videos. Meanwhile the Carling Facebook page focused 
mainly on sport, with the Carling twitter account based 
around the Carling Cup, a football competition, rather than 
Carling itself. 



Age restrictions to alcohol marketing on social 
media websites 

We created profiles for a fictitious 14-year-old and a 
24-year-old user to access alcohol brand-related social media 
websites. Each of the five marketer-generated brand pages on 
Facebook had age restrictions in place that meant that they 
could only be accessed by the 24-year-old user. 

Conversely, YouTube does not require users to sign in 
before viewing video content, thereby making all content ac- 
cessible to users of any age. Moreover, even after the age- 14 
user had completed the optional sign-in process, they were 
still able to access and subscribe to all five alcohol brand chan- 
nels, demonstrating that no age restrictions were in place for 
YouTube content. 

Twitter does not register the age of those signing up for a 
twitter account and does not operate a mechanism for age re- 
striction unless the brand marketers require users to verify 
their age through an external mechanism. Three of the five 
Twitter accounts could be accessed by both the 24-year-old 
and 14-year-old fictitious users; however, both Stella Artois 
and Carling required an age approval process before users 
could 'follow' the twitter account and see the tweets. In the 
case of Carling this involved accessing the Carling website 
and entering personal information, including confirmation that 
the user was over the legal drinking age. Stella Artois twitter 
stated that the account was protected and that the follow 
request was pending at the time of undertaking the research 
(21 February 2012) (Twitter, 2012a). In both cases these 
sign-up requests then had to be processed by the twitter 
account managers. This process was not completed during the 
2-month data collection period and we were therefore unable 
to monitor the frequency and type of tweets being made for 
these accounts during the study period. At the time of writing, 
this issue had still not been resolved. 

A further common approach intended to prevent under- 
age users from viewing alcohol-related content is a message 



Exposure to alcohol marketing on social media websites 
Table 3. Marketer-generated content on Facebook, YouTube and Twitter (February and March 2012) 



157 



Marketer-generated content 


Foster' s 


Carling 


Tia Maiia 


Stella Artois 


Magners 


Facebook {accessed 21 


http:/'www. 


httpi/'w WW. facebook. 


httpi/'w WW. facebook. 


http://www.facebook.com/ 


httpi/'www.facebook. 




Tnppnnnk" pnm/ 

1 0.^ U LJ . U LJl 1 J/ 


rriTTi/l'nrliTi cr 
v^vjiiiy v^£ii 1111^ 


rrim/ti nmnnnrinnlr 

\^\JllU Llulll£ll luLllllllV 


Qfpllnai'tnicn V 


rTttn/mn trnpr^iPirlpr 

V^Wlil/ lllu^llUl AUILIUI 




fosters 










Like' button 


V' 




■/ 


✓ 


✓ 


Pa CTP wnll 
1. wa.il 


■/ 






✓ 


✓ 


Video advert 




■/ 


■/ 


✓ 




Competitions/ free 




•/ 


■/ 


✓ 




V Ccl W ay a 
























pT^^imnlp(; nnnitiriTml 


r'ninpriv viHpnQ 


vnnTtc into 

fcjIJVJlLo llllU 


1 nplrtail rppinpc 

V^UL.R.l£lll ICUllJ&d 


A fi vprtc 

j^LE V tl 


Tw/ittpt" Tppri 

J WJlltl l^CLl 


content/applications 




Music info 


Mask yourself app 


Prize draw 




on page 




Photos and videos of 


Information about ad 










football 


campaign 






Frequency of brand 


Daily 


>weekly 


>weekly 


>weekly 


Daily 


cominents on wall 












Link to website 


■/ 




■/ 


✓ 


■/ 


Link to drinkaware 


■/ 






✓ 


■/ 


Link to Twitter 


— 


— 


— 


— 


■/ 


YouTube (accessed 21 


/fosters 


/carlinglageruk 


/ti amariadrink 


/StellaArtoisAnno 1 366 


/UKMagners 


March 701 2> 












i'lLllllUCl \Jl V IQCUS 


97 


2 


16 


10 


17 




21 March 201 2 

^1 lVJ.uJ.UJJ jL.\J 1 jL. 


22 Febniarv 2012 


S npremher 901 1 

.J l_y^L-dllU^l A^KJ L J 


Tiilv 14 201 1 

J Lii y iT^i i-vj J J 


March 21 2012 

iVJaJUll ^Ij V Ad 


Marrh 9019^ 












T^^npQ r\\ ^Jinpo pnntpnl" 


f'nmprlv viHpoq 
v.^vjjjjci_i y V j\-i&L/d 


A n vprtc 

z^U. V tjl 


A ri\jprl"i; 

z^Ll V Cl L J 


A ri vprf*; 


A ri\jprl"c 

/^VJ V Cl 13 




Adverts 




Demonstrations of 




Comedy videos 








cocktail recipes 












Footage of events 






Link to website 






-/ 






Link to Facebook 


— 


— 


■/ 


— 


— 


Link to Twitter 












Link to drinkaware 


— 




— 


— 


— 


Age control message 


— 






— 


— 


Twitter (accessed 2 1 


@ fostersfunny 


@ thecarlingcup 


@ tiamariadrink 


@ Stella Artois 


@ Magners UK 


Fphniarv 901 9"! 












i'lLllilUCl \JL IWCCLS 


1873 


252 


536 


466 


2560 


Frequency of tweets 


>daily 


Restricted 


>weekly 


Restricted 


>weekly 


Tweet subjects 


Comedy videos 


Restricted 


Recipes 


Restricted 


Facts and suggestions 








Fashion 




about Magners 








Responses to followers 




Questions 








comments 




Responses to followers 












comments 


Link to drinkawai^ 




Restricted 








Age control message 













Key: 'v^' indicates that item is present; '-' denotes item not present; '> weekly' refers to 'at least once per week'. 



on the relevant page stating, for example, 'You must be of 
legal drinking age in your country to follow ©tiamaria- 
drink.' (Twitter, 2012b). Only two of the five YouTube 
channels (Carling and Tia Maria) provided such a message. 
Twitter displayed a higher number of age-related messages, 
with four out of five brands including an age control 
message on their brand page. 



DISCUSSION 

To our knowledge, this is the first study attempting to describe 
the exposure of children and young adults to alcohol marketer- 
generated content on social media websites in the UK. We 
have provided evidence that social media websites such as 
Facebook, YouTube and Twitter are heavily used by children 
and young adults, and that such sites are used for marketing 
by alcohol companies. 



In the absence of detailed knowledge about the ages of 
those viewing each page, we have provided an overview of 
population engagement with specific brand pages through the 
'likes', 'follows' and video views recorded on Facebook, 
Twitter and YouTube, respectively. Although it was not pos- 
sible to determine the proportion of young people in these 
user groups, it seems likely in cases where there are no age 
restrictions, (YouTube and Twitter) that many young people 
could be accessing alcohol-related content. 

The systematic use of age restrictions on alcohol content 
was limited to Facebook; no mechanism for restriction of 
viewers on the basis of age was found on YouTube or Twitter 
websites. However, although Facebook requires that all 
alcohol advertising is targeted at the appropriate age demo- 
graphic for each country (Facebook, 2012a), there is currently 
no method for monitoring whether Facebook users are stating 
their true age. Our data suggest that incorrect ages are often 
given on the Facebook profiles of younger children. Facebook 
requires users to be at least 13 years of age to sign up for an 



158 



Winpenny et al. 



account (Facebook, 2012d). Yet, according to our data, 39% 
of boys and 48% of girls aged 6-14 accessed Facebook during 
December 2010 to May 201 1 . 

Current regulation of alcohol marketing online is covered 
by the UK Code of Non-broadcast Advertising, Sales 
Promotion and Direct Marketing (The CAP code) (Committee 
of Advertising Practice, 2010) which stipulates 'no medium 
should be used to advertise alcoholic drinks if >25% of its audi- 
ence is under 18 years of age' (Committee of Advertising 
Practice, 2010). As we have shown, a very high proportion of 
young people use social media websites. This suggests that the 
current cut-off limit of 25% of the audience is either not imple- 
mented, or not sufficient to protect children. In order to protect 
children from alcohol advertising, it will be necessary either to 
implement a comprehensive ban on internet alcohol advertising, 
or to put in place more effective measures to reduce exposure. 

Previous studies have discussed the ways in which social 
media marketing is used to attempt to engage social media users 
with the brand. Techniques include the use of interactive content 
(Chester et al., 2010), the encouragement of word-of-mouth 
marketing between users (Mart, 201 1), and the use of viral mar- 
keting, an extension of word-of-mouth marketing (Montgomery 
and Chester, 20 11, Petrescu and Korgaonkar, 20 11). It has been 
suggested that use of these techniques means that social media 
marketing may have a stronger effect than traditional advertising 
on young people (Montgomery and Chester, 2009). Our study 
identified a number of strategies where alcohol marketers 
attempted to encourage interaction between social media users 
and the alcohol brand. These included the use of the 'like' 
button, posting of comments and questions on Facebook pages 
or Twitter feeds, the use of competitions and provision of add- 
itional material such as comedy videos or sports information 
which the user might find interesting or amusing. 

This study has a number of limitations. Firstly, we focused 
our case studies of five alcohol brands on only three social media 
websites. These websites were identified from our data as the 
social media websites which were most used by young people; 
however, there remains potential for children to be exposed to 
alcohol marketing through other social media websites. 
Demographic data were only available at the level of the websites 
rather than individual pages, so we were unable to identify the 
ages of those engaging with individual alcohol-related pages, or 
the amount of time users spent viewing or engaging with 
alcohol-related pages. In addition, we have provided just a snap- 
shot of the current availabiUty of and engagement with alcohol- 
related content using selected alcohol brands. Online content 
changes frequently and further work should seek to explore the 
changing nature of content over a longer time period. 

This study has demonstrated a potential for high exposure 
of children and young adults to alcohol marketing through 
social media websites. This, together with existing evidence of 
an increased likelihood of initiation of underage drinking at- 
tributable to alcohol marketing exposure (Anderson et al., 
2009), indicates a need to monitor and, if necessary, impose 
further restrictions on online marketing. 

Funding — This work was based on data derived from a Service Contract with the 
Executive Agency for Health and Consumers, under the EU Health Programme. The 
opinions expressed are those of the Contractor only and do not represent the Executive 
Agency's and the European Commission's official position. The Behaviour and Health 
Research Unit (BHRU) is pait funded by the UK Departinent of Health Policy Research 
Programme as the Policy Research Unit in Behaviour and Health (PR-UN-0409-10109). 
The Department of Health had no role in the study design, data collection, analysis, or 



interpretation. The research was conducted independently of the funders, and the views 
expressed in this paper are those of the authors and not necessarily those of the funders. 
Funding to pay the Open Access publication charges for this article was provided by the 
Behaviour and Health Research Unit. 

Conflict of interest statement. None declared. 



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